<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <!-- h5, h3, h6不加粗体 -->
    <style>
        h3,
        h5,
        h6 {
            font-weight: normal;
        }
    </style>

    <!-- h6-title 居中 -->
    <style>
        .h6-title {
            text-align: center;
        }
    </style>

    <!-- P标签（红色） -->
    <style>
        p span {
            color: red;
            font-weight: 700;
        }
    </style>

<!-- 绿色、无下划线、斜体、字间距3px -->
    <style>
        #link {
            text-decoration: none;
            font-style: italic;
            letter-spacing: 3px;
            color: green;
        }
    </style>

<!-- BBB这行背景为蓝色，字体白色 -->
    <style>
        #tr-01+tr {
            background-color: blue;
            color: white;
        }
    </style>

</head>

<body>

    <h1>测试标题1</h1>

    <hr />
    <h3>测试标题3</h3>
    <h5>测试标题5</h5>


    <h6 class="h6-title">这个h6需要居中</h6>

    <hr />
    <div>这个是<span>div标签</span>中的文字</div>
    <p>这个是<span>P标签（红色）</span>中的文字</p>

    <hr />
    <a id="link" href="test0.html">链接到test0页面</a>

    <hr />
    <table border="1">
        <tr id="tr-01">
            <td>1</td>
            <td>AAA</td>
        </tr>
        <tr>
            <td>2</td>
            <td>BBB</td>
        </tr>
        <tr>
            <td>3</td>
            <td>CCC</td>
        </tr>
    </table>
</body>

</html>